履歴法による実働応力下の疲れ寿命の推定法

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  • Evaluation of the Fatigue Lives under Actual Load by Hereditary Method
  • リレキホウ ニ ヨル ジツドウ オウリョク カ ノ ツカレ ジュミョウ ノ スイテイホウ

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At the fatigue test under actual load, the induced strains become rather stabilized after some number of cycles, and the stress-strain curves show loops according to the stress wave forms. Therefore, plastic strain εp is supposed to be caused by the deviatric stress of each stress peak i from the mean stress of the wave. Then, the influence of other stress peaks for the εp of a peak is analogized bv the static stress-strain curve in the plastic range. And the stress amplitude of ordinary fatigue test that causes the same plastic strain as the peak i is called as an equivalent stress amplitude σeq, i and its cumulative distribution curve is drawn. And then, program test or cumulative fatigue damage law according to the distribution curve is adopted the evaluation of fatigue lives under the actual stress wave form.

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